The system consists of just five parts: anchors, rails, main crossbars, secondary crossbars, and ¼-inch thick 2-foot by 2-foot panels. The anchors and rails work like a French cleat. Each anchor ...

We measured the width of an anchor and divided it by 2. This gave us a point where the edge of each anchor should be on the joist above. The anchors must be installed in a straight line.